If your criticism of this position is "who cares, it's just spiders" then you're essentially saying it's not a big deal because it doesn't involve something you

If your criticism of this position is "who cares, it's just spiders" then you're essentially saying it's not a big deal because it doesn't involve something you give a shit about, never mind that it's the principle -- not the subject matter -- that is being argued here. What's the name of this logical fallacy. Ad idiotim?